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2017 3.5 - what grade fuel?

 
Old 09-26-2017, 02:33 PM
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Default 2017 3.5 - what grade fuel?

Dealer gave me a free tank of gas (A 36 gallon value!)

However Ive seen a few posts here and there that mention running 91 octane over 87..

Did a search and didn't see too many threads specific on the topic.

What is the best grade to run? It's a lease so I'm not too worried about keeping things clean inside the engine. More towards what will give best power rating & what will give best MPG


Thanks,
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Old 09-26-2017, 02:42 PM
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87 is fine. if you tow, use premium.

You might actually get better mpg on premium....but enough to make up for the extra coin?
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Old 09-26-2017, 02:46 PM
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87. even if it wasnt a lease, that grade fuel is fine. use 87 towing as well - may ping a bit if really hot and heavy load - but its a lease. The guy who buys used will have to deal with it.
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Old 09-26-2017, 02:46 PM
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Owner's manual : 87 minimum - 91 under extreme usage. I guess the ones that says you need premium fuel are also the ones that says you need to do 5k oil change

You might get better MPG by putting premium fuel, but I doubt it will make up for the extra $.

The one thing you want to worry about is the % of ethanol contained in the fuel. Less is better.

Last edited by Eduskator; 09-26-2017 at 02:50 PM.
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Old 09-26-2017, 03:12 PM
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87 for 77k and all good so far. I tried 91 a few times (several tanks in a row each time for the ECU to adjust) and I never saw a difference in mileage or power. Always use 87 now, even when towing. No pings, no horrible mileage or anything. As the book says, use 91 for "severe towing", as in, your max tow capacity and up steep grades where you engine might ping. That's about it.
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Old 09-26-2017, 03:21 PM
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Good to know guys.

Typically I drive 70-75 on the highway and I was hoping the 10 speed auto would grant some better fuel numbers if maybe I went to a higher grade fuel. Doesn't sound like that's the case.

And doubt I'll ever tow anything with this truck. Tho we might buy a travel trailer soon.. but it'd be half of trucks capacity if we did.
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Old 09-26-2017, 03:23 PM
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I'm just curious as to the folks that say stay with 87 octane, what is your average temperature and humidity during the summer?

Around the southwest where the temperature is at 115 and the humidity is at 19%, you just might see a bit better performance out of a tank of 91 octane. Not so much better fuel economy, but less engine knock, (that you don't hear because the timing is retarded, thus reducing power output ).
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Old 09-26-2017, 03:23 PM
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If i had a dollar for every time this question was asked on a forum....

87 all day long. ~mic drop~
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Old 09-26-2017, 03:27 PM
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I guess the ones that says you need premium fuel are also the ones that says you need to do 5k oil change.
Really? Was that a necessary comment, considering the oil change threads have been beat to death.
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Old 09-26-2017, 03:38 PM
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Originally Posted by adammjarvis View Post
Good to know guys.

Typically I drive 70-75 on the highway and I was hoping the 10 speed auto would grant some better fuel numbers if maybe I went to a higher grade fuel. Doesn't sound like that's the case.

And doubt I'll ever tow anything with this truck. Tho we might buy a travel trailer soon.. but it'd be half of trucks capacity if we did.


Yeah my travel trailer is 5000 lbs but very flat front, so it doesn't like high speeds (like towing a sail) and my boat is 7500 lbs. Both tow just fine with 87.
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